2-halogeno-2-deoxy-5-(substituted)uridines

ABSTRACT

IN WHICH X is halogeno and Y is halogeno, thiocyanato, are useful as antiviral agents or as intermediates in the synthesis of biologically active nucleosides, nucleotides or polynucleotides.   Compounds of the formula

United States Patent 1191 Kotick et a1.

1 1 Z-HALOGENO-Z-DEOXY-S- (SUBSTITUTEDlURIDINES [75] lnventors: Michael Paul Kotick; Joseph Odo Polazzi, both of Elkhart, Ind.

[73] Assignee: Miles Laboratories, 1nc., Elkhart,

Ind.

[22] Filed: May 29, 1973 [21] Appl. No.: 364,700

[52] US. Cl. 260/2115 R, 424/180 [51] Int. Cl C07d 51/52 {58] Field of Search 260/2115 R [56] References Cited UNITED STATES PATENTS 3.463.850 8/1969 Shen et a1. 260/2115 R 3.687.931 8/1972 Vcrheyden et a1 260/2115 R 3.775.397 11/1973 Etzold ct a1 260/2115 R 51 Mar. 11. 1975 Primary Examiner'lo'hnnie R. Brown [57] ABSTRACT Compounds of the formula 0 Y 11 I HOCH All HO X diates in the synthesis of biologically active nucleosides, nucleotides or polynucleotides.

4 Claims, No Drawings Z-HALOGENO-Z-DEOXY-S- (SUBSTITUTED )URIDINES SUMMARY Compounds of the formula C N r HOCH i H (i X wherein X is halogeno and Y is halogeno, thiocyanato, comprise the subject matter of this invention.

Preferred embodiments of these compounds include: 1. 2'-fluoro-2'-deoxy-5-fluoro-uridine; 2. 2-chloro-2'-deoxy-5-fluoro-uridine; 3. 2'-bromo-2'-deoxy-5-fluoro-uridine; 4. 2-f1uoro-2'-deoxy-5-chloro-uridine; 5. 2'-chloro-2'-deoxy-S-'chloro-uridine; 6. 2'-bromo-2'-deoxy-5-chloro-uridine; 7. 2'-f1uoro-2'-deoxy-5-bromo-uridine; 8. 2-chloro-2-deoxy-5-bromo-uridine; 9 2'-bromo-2-deoxy-5-bromo-uridine;

. 2-fluoro-2-deoxy-5-iodo-uridine; 2'-chloro-2-deoxy-5-iodo-uridine; 2-bromo-2-deoxy-5-iodo-uridine; 2'-f1uoro-2-deoxy-5-thiocyanato-uridine; 2'-ch1oro-2-deoxy-5-thiocyanato-uridine; 2-bromo-2'-deoxy-5-thiocyanato-uridine; 2'-f1uoro-2-deoxy-5-mercapto-uridine; 2'-chloro-2-deoxy-5-mercapto-uridine; 2-bromo-2'-deoxy-5-mercapto-uridine; 2-fluoro-2'-deoxy-5-disulfhydryl-uridine; 20. 2'-chloro-2'-deoxy-5-disulfhydryl-uridine; Compounds having Formula 1 can be prepared according to the following reaction sequence:

noon,

(III) noon,

In the above series of reactions, X and Y are groups as defined above for Formula I; R represents hydrogen or acetyl substituents.

The synthesis of 2,2 '-anhydro-1-(B-D- arabinofuranosyl) uracil (Formula II) and its conversion to 2'-halogeno-2-deoxyuridine substituted at either the 5 or 4 position (Formula Ill) can be performed according to published methods (Codington et al., J. Org. Chem., 29: 558 [I964]; Codington et al., J. Org. Chem., 29: 564 [1964]; Doerr et al., J. Org. Chem., 32: 1462 [1967]; and Cushley et al., Can. J. Chem., 46: 1131 [1968]), The 2'-fluoro-2'-deoxycytidine analogues of Formula II, however, were prepared by the procedure of Hendler and co-workers (Abstracts, 162nd National Meeting of the American Chemical Society, September, 1971, No. Biol. 20) or of Shannahoff and Sanchez (J. Org. Chem., 38: 593 [1973]).

The conversion of Formula III to Formula I can be accomplished by the following methods: the 5-fluoro analogues were prepared according to the reaction described by Robins and Naik (J. Amer. Chem. Soc, 93:

5277 [1971]; Chem. Comm., 18 [1972]); 5-chloro and S-bromo derivatives were made by the pathway described by Fukuhyana and Visser. (J. Biol. Chem., 190: 95 [1951]); 5-iodo compounds were synthesized according to Prusoff et al., (Cancer Res., 13:22] [1953]; Biochim. Biophys. Acta, 32: 295 [1959]); and the 5- thiocyanato derivatives were prepared by the method of Waters and Witkop (Chem. Comm., 1025 [1972]).

Compounds having Formula I have varying antiviral activity, relative to arabinosylcytosine, a known inhibi' tor of DNA viruses.

Screening was conducted with Herpes Simplex Virus Type 2 (HSV, a DNA virus) in VERO cells (African green monkey kidney) and the Indiana Strain of Vesicular Stomatitis Virus (VSV, and RNA virus) in mouse L cells. The virus was allowed to adsorb to the cells for 1 hour after which the cells were washed once with medium and the test compound then added in serum-free medium. After a 16 hour incubation in the presence of the test compound, the supernatant was collected and made cell-free by centrifugation. Titration of virus in these preparations was done in the appropriate host cells. All compounds were tested at 0.32 M.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples 1-3 5-Fluoro-2'-Halogeno-2'-Deoxyuridines The following 5-fluoro-2'-halogeno2'-deoxyuridines were prepared according to the procedure published by Robins and Naik (Chem. Comm, 18 [1972]) from corresponding 2 '-halogeno-2-deoxy-3 ',5 -di-O-acetyluridine.

A solution of the appropriate diacetate, 4 mmoles in 1:1 CFC1 :CHCl (70 ml), was cooled in a CO -Me CO in 60% yield. Crystallization from absolute EtOH gave an analytical sample as white crystals, m.p. l30-l35. 5-Chloro-2 chloro-2'-deoxyuridine (C H Cl N O was crystallized from absolute EtOH to give pure matebath and treated with a slow stream of CF OF for 5 5 rial, m. p. 210-212. 5-Chloro-2-bromo-2'- minutes (3-5 g). The cooling bath was removed, and deoxyuridine (C H clBrN O m.p. 195-197, was the solution warmed to room temperature and evapo obtained in two crops (47 from EtOAc.

Formula Calculated for Found C H N C H N C,,H,,ClFN 38.51 3.59 9.98 38.26 3.61 8.63 C,,H,.,C|,N,0 36.38 3.39 9.43 36.38 3.47 9.43 C,,H,,,Brcn-1 0 31.65 2.95 8.20 32.02 2.97 8.07

rated. The residue was treated with TEA in MeOH:H O (1:1, 50 ml) for 1-2 hours. Evaporation followed by chromatography on silica gel yielded a foam. 5-f1uoro-2'-fluoro-2-deoxyuridine (C H F N O was obtained in 60% yield. Crystallization from EtOH gave an analytical sample, m.p. l4815l. 5-fluoro-2 -chloro-2 '-deoxyuridine (C H C1FN O yielded 53% of a foam. Crystallization from EtOH gave an analytical sample with m.p. 97100.

5-f1uoro-2'-bromo-2'-deoxyuridine (C H BrFN O Due to the base instability of the parent nucleoside, the adduct was decomposed and deacetylated by use of concentrated HCl (5 ml) in MeOH (25 ml) for 5 hours. Removal of the solvent and residual HCl by azeotropic distillation with EtOH:PhH was followed by chromatography to give the desired product as a foam in 26% yield. Crystallization was effected from EtOH to give an analytical sample, m.p. 97-l00.

Examples 7-9 To a solution of the corresponding nucleoside in H 0 was added Br -Br water until a permanent yellow solution was obtained. After stirring 30 minutes, the solution was aerated until colorless, the solvent removed and the syrup azeotroped with absolute EtOH:PhH. The residue was refluxed in absolute EtOH for 30-60 30 minutes and the solution evaporated to dryness. 5-

Bromo-2'-fluoro-2-deoxy-uridine (C H BrFN O was obtained" as a foam in 52%. Crystals, m.p. l62-l65, were obtained from absolute EtOH. 5- Bromo-2'-chloro-2'-deoxyuridine (C H BrClN O Formula Calculated for Found H C 1-1 N C,,H 1,FQN O,, 40.91 3.81 10.60 41.27 3.99 10.46 C HmClFN O 38.51 3.59 9.98 38.32 3.83 9.84 H BrFN O 33.25 3.81 8.62 33.43 3.44 8.64

Examples 4-6 solidified on trituration with CHCl zMeOH to give crys- 5-Chloro-2-Halogeno-2'-Deoxyuridines The 5-ch1oro-2'-halogeno-2-deoxyuridine derivatives described below were obtained from 2'-halogeno- 2-deoxy-uridines by the method reported by Fukuhyana and Visser (J. Biol. Chem, 190: 95 [1951]).

tals, 1.56 g m.p. 2l2-2l6. Recrystallization twice from absolute EtOH gave pure material, m.p. 2l3-2l6. 5-Bromo-2'-bromo-2-deoxyuridine c u er mo was obtained in crystalline form, m.p. 187-189, after chromatography and crystallization from EtOAc.

Formula Calculated for Found C y H N C H N C H BrFN O 33.25 3.10 8.62 33.41 3.17 8.58 C l-l BrClN O 31.65 2.95 8.20 32.01 2.98 8.08 C H Br N O 28.00 2.61 7.26 28.21 2.79 7.13

Examples 10-12 60 5-Iodo-2'-I-1alogeno-2-Deoxyuridines The 5-iodo-2'-halogeno-2'-deoxyuridines which follow were synthesized pursuant to Prusoff et al., (Cancer Res, 13: 221 [1953]; Biochim. Biophys. Acta, 32:

295 [1959]). In lieu of 1 in acid-water-chlorolorm,

however, N-iodo-succinimidc was utilized for a more effective reaction.

To a hot solution of the corresponding 2-halogeno- 2'-deoxyuridine (2mmole) in glacial HOAc ml) was added N-iodo succinimide (3 mmole). Heating was continued on the steam bath 30-60 minutes, the solution cooled and evaporated. The residue waschromatographed using CHCl :MeOH (6:1 or 8:1) as the eluent. 5-Iodo-2-fluoro-2-deoxy-uridine (C H FIN- 0 was obtained as a white solid (47%), m.p. 2l5-218. 5-lodo-2'-chloro-2'-deoxyuridine (C H ClIN O was obtained in a yield of 31%, and was recrystallized from H O to give pure material; the melting point was indefinite with evolution of 1 at 180. S-lodo-2'-bromo-2'-deoxyuridine (C H BrIN O was obtained in 25% yield and was recrystallized from CHCl zMeOH (8:1) to give an analytical sample, m.p.

6 2-Bromo-2'-deoxy-5-thiocyanato-uridine: In a similar manner, the mentioned compound was obtained as a clear syrup after chromatography which solidified upon trituration with ether to give a homogeneous solid 5 in 44% yield. Recrystallization from MeOH gave pure white crystalline material with m.p. l7l174.

Calculated for C H BrN O S: C, 32.98; H. 2.7 Found: C. 32.72; H, 2.7 1 UV AM, (MeOH) 272 mu. 1R. y 2160 cm" xcn.

2'-Fluoro-2'-deoxy-5-thiocyanato-uridine was similarly prepared.

What is claimed is:

17904820 with evoluticn of 15 l. A compound having the formula Formula Calculated for Found H C N CQHMFINZQ, 29.05 2.71 7.53 29.25 2.81 7.60 CQHIUCIINZOF, 27.82 2.59 7.2] 27.92 2.67 7.36 C.,H...Br1N,0, 24.96 2.32 6.47 25.22 2.39 6.49

Examples 13-15 0 2'-Halogeno-2'-Deoxy-S-Thiocyanato-Uridines Y 2-Chloro-2'-deoxy-5-thiocyanato-uridine: To a cold H N solution of Cl (2.82 g, 40 mmoles) in dry HOAc (100 OJ\ 1 ml) was added KSCN (4.86 g, 50 mmoles) and the resultant mixture was filtered and to the filtrate was HOCHZ 0 added 2'-chl0r0-2-deoxyuridine (1.07 g, 4 mmoles). After stirring for 30 minutes, cyclohexene (20 ml) was added and stirring continued for an additional 15 minutes. After evaporation of the solvent in high vacuum (30), the brown residue was triturated, first with pe- HO X troleum other, then ether. The residual material was taken up in hot absolute EtOH, charcoaled, filtered and evaporated. The residue was chromatographed on silica gel using 7:1 CHCl zMeOH as the eluent. The major fractions were impure; the material was recombined Wheremi and rechromatographed using 8:1 CHC1 :MeOH Crys- 40 X is Selected from substituents consisting of fluoro, tallization of the major component was effected from chloro, and bromo; and, EtOH ether to give crystals, m.p. 183-l85. Drying in Y is thiocyanato. vacuo at 60 gave an analytical sample. For other de- 2. A compound as in claim 1, 2-fluoro-2-de0xy-5- tails refer to procedure of Waters and Witkop (Chem. thiocyanatomridine, Commw 1025 3. A compound as in claim 1, 2'-chloro-2'-deoxy-5- thiocyanato-uridine. E3113? forcmHmclNaofisi g? S g A compound as in claim 1, 2-bromo-2-deoxy-5- UV. A (MeOH) 272 mu. 1R, (SCN) 216 cm (KCl). thl0Yanat0-uf1d1ne- 5O l l- 4 

1. A COMPOUND HAVING THE FORMULA
 1. A compound having the formula
 2. A compound as in claim 1, 2''-fluoro-2''-deoxy-5-thiocyanato-uridine.
 3. A compound as in claim 1, 2''-chloro-2''-deoxy-5-thiocyanato-uridine. 